More than just about any other philanthropists, Pierre and Pam Omidyar have blurred the lines between their non-profit giving, and their for-profit investments, which can make it even more difficult to assess their giving than it otherwise would be.

Becoming billionaires when eBay went public in 1998, the Omidyars quickly developed an interest in philanthropy, and in 2001, Pierre publicly stated his intention of giving away most of his fortune in his lifetime. So how are the Omidyars doing so far?

<a href="http://www.huffingtonpost.com/2012/03/19/apple-us-tax-law_n_1362934.html" target="_hplink">Apple CFO Peter Oppenheimer said</a> last year that Apple plans to keep its cash overseas because of U.S. tax policy. <a href="http://www.nytimes.com/2012/04/29/business/apples-tax-strategy-aims-at-low-tax-states-and-nations.html?pagewanted=all&_r=0" target="_hplink">Apple paid a global effective tax rate</a> of just 9.8 percent in 2011, according to The New York Times.
(AP Photo/Eric Risberg)